Sparking plug for explosive-engines.



H. D. POMIJE.

SPABKINGM POR EXPLGSIVE ENGlNBS. K

Patented Feb. 10, 1914. L

APPLICATION FILED FEB.15,1912.

af p w 4 HENRY D. POMIJE, OFOLIVIA, MINNESOTA SPARKING PLUG FOR EXPLOSIVE-ENGINES.

Specification of Letters Patent.

Patent-ed Feb. 10, 1914.

Application filed February 15, 1912i. Serial No. 677,794.

To all fui/wm 'it may concern Be it known that I, HENRY D. PoMIJn, a citizen of the United States, residing at Olivia, in the county of Renville and State of Minnesota, have invented certain new and useful Improvements in Sparking Plugs tor Explosive-Engines; and I do hereby declare the following to be a full, clear, and'exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

IMy invention has for its ohjectto provide an improved sparking plug` for explos1ve englues and. to such ends, generally stated, the

Iinvention consists of the novel devices and --rombiuations of devices hereinafter described and defined in the claim.

Hitherto sparking plugs have been provided with a plurality of sparking points of one polarity. arranged for coperation with a single Contact point or member of tle opposite polarity. Also in another form "of sparking plug, a spherical head operating as one electrode, has been placed within a ring used as the cooperating electrodeof the plug. The former noted device has tlns serious defect that, if the one c .imon electrode should become insulated or disabled. by aceumulation of deposits thereon, then the plug is rendered inoperative. The latter noted form of plug hasno definite coperating points, andis extremely liable to be put out of .use by the accumulation of carbon deposits thereon, and by oil, which when in contact with the annular electrode, quickly covers the entire surface thereof.

A In my improved sparking plug, both of the live or electrically charged members of the sparking plug are provided with a plurllity of electrodes or sparking points, and t 1e sparkingr points of the one member are alined for eoperation with different sparking points of the other member. -In this way, the sparking plug will remain 1n good pperating condition as long as any one of the sparking points of one electrode is in proper condition for cooperation `with a sparkingr point of the other electrode. This, as is evident, reduces to a minimum the possibility of the plug being disabled by accumulati-.fin of carbon or other insulating materials upon the electrodes of the sparking plugs.

The invention, in its improved form, is

l5 illustrated in the accompanying` drawings,

| wherein like characters indicate like parts throughout the several views.

Referring to the drawings, Figure l' is a vertical section taken through the improved sparking plug and showing the same applied to the cylinder of an explosive engine, some parts being' broken away and some parts being shown in full; Fig. 2 is a bottom plan view of the sparking plug; Fig. 3 is a horizontal section taken on the line mg w3 of Fig. 1; and Fig. 4 is a horizontal section taken on the line :v4 w* of Fig. 1.

The numeral l. indicates a portion of the cylinder' of an explosive engine.

The improvedy sparking plug is made up. ehielly of three main elements, 2, 3 and 4. The element 2 is a metallic socket having a threaded shank screwed through. the cylinder 1 with a gas tight joint. The element 3 is an insulating sleeve, referably of 75 porcelain, and about one-hall) of which is contained within the socket 2. The lower end of the sleeve 3 is reduced in size and is formed with an exterior surface 3 that is squared in cross section and fits a squared seat in the shank of the socket 2, see particularly Fig. 3.

The element 4 is a screw threaded metal rod that extends entirely through the insulating sleeve 3 and projects at its upper and 85 lower ends. The central portion 4* of the' rod 4 is made square in crosssection and fits a squared seat in the insulating sleeve 3.

The numeral 5 indicates a packing gland which is screwed into the Socket 2 and se- 90 curely holds the insulating sleeve 3 interloeked to the said socket 2.

The numeral 6 indicates a binding nut working in the threaded upper end of the rod 4.

'lhe numeral 7 indicates a cap applied on the upper end of the sleeve 3 and through which the threaded upper end of the rod 4 is loosely passed. lVorking in the threaded lou er end of the rod 4, but within the lower 160 end portion of the sleeve 3, is a knurled nut S that bears against an internal shoulder of the said sleeve and cooperates with theA nut (3 to rigidly secure the said rod 4 to the said sleeve with freedom for endwise adjustments ir respect thereto. The lower or inner extremity' of the rod 4 is formed with a plurality of radially projecting circumferentially spaced sparking points 9, there being, as shown, four of these. For eooperation with the sparking points 9, the socket 2 at its inner end is provided with parallel circumferentially spaced rod like projections l0 that afford the correspond ing sparking points radially -alined with the sparking points 9.

Inasmuch as the squared portion 3a of the insulating sleeve 3 fits a squared seat in the socket 2, and the rod 4 has a squared portion fitting a squared seat in the said sleeve 3, it is evident that, with the four sparking points 9 located ninety degrees apart and with the four sparking points or rods 10 correspondingly spaced, it is impossible to put together the elements of the sparking plug without setting the cooperating sparking points 9 and 10 in proper coperative alinement. It also follows that the said sparking points cannot Work out of proper coperative alinement. By adjustments of the rod 4, the sparking points 9 may be set any desired distance within the Cylinder and, in all adjustments of the said rod, the sparking points 9 will maintain the proper operative relation to the sparking points or rods l0. Y

llVith the above described arrangements, it is evident that there are always four pairs of coperating sparking points 9-10, so that to render the sparking plug inoperative, all four pairs of sparking points, would have to be disabled. at one time. This, of course, very greatly reduces the liability 0f the plugbeing disabled by accumulations of carbon, oil or any foreign substances resulting from explosion of gas in the cylinder.

The sparking plug described, is of small cost, is easy to assemble, apply and properly adjust, and is highly eflicient for the purposes had in view.

It may be further added that a sparking plug to be efficient, must prot-rude into the cylinder' Y to a certain point, to-.wit, the

sparking points must be. close to the plane\ of the inner surface of the head of the cylinder in which it is applied. It the sparking points project too far into the center or it they do not project out of the sparking plug hole in the head of the cylinder, an

irregular explosion or mis-tiring will be the.

result. The non-adjustable sparking plu hitherto generally employed are practical y only for one particular size of cylinder.

My adjustable multi-sparking plug can be' set with its sparking points at the properl place Within a cylinder of any size, and

hence, is adapted for use as a sparking plug on any and all makes of automobiles or vehicles propelled by explosive engines, and also, of course, the engines used for other purposes. This carries with it the. additional advantage that' the numerous small handlers of plugs will'not be obliged to keep a stock including a large number of different sizes of sparking plugs.

ln a. sparking plug, two insulated from each other and the one extended axially through the other, the outer member having a plurality o-f lsparking points formed by metallic rods projecting" therefrom parallel to each other and parallel to the axis of the plug, and the inner member having a plurality of sparking points for eoperation with the said rods, and the said inner member and its sparking points being axially adjustable so as to materially change the projection of the operative portions of the points froxnthe body ofY the plug.

lIn testimony whereof I atlix my signature in presence of two witnesses.

HENRY D, 'PoMtIJn Witnesses: M. R. LA POINTE,

J. M. FREEMAN.

metallic members 

